These cars had a very common problem with the hose that goes to the PCV valve. The rubber elbows in the hose rot out and create a big vacuum leak. Inspect the hose that goes to the PCV valve and replace any worn parts and your problem will be solved.

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it could be a blocked fuel filter ,a bad idle solinoid , a week fuel pump, a bad throttle position sensor ,dirty air filter , If car is not running ruff before putting in gear . if running ruff all the time it could be bad plugs,injectors coils plug wires or any of the above. check for a vaccume leak it is a # 1 problem with windstars. if this was helpful please leave good feed back

The basics for a rough idle, check for a leak of some kind, fuel--egr--vacuum.
Use a gage and check proper fuel pressure. Also, see if pressure will hold for a bit with everything off. If it drops like a rock, you have a fuel pressure leak. Check the vac line on fuel pressure regulator, where applicable, if it has gas in it, the regulator is faulty.
Smell of your crankcase oil dipstick, does it smell like gas? If so, either you don't change oil and filter very often or there is a fuel leak getting into your oil.
Any applicable trouble codes?

When you start your car, you step on the gas and turn the key, you have set the high idle feature on the carb as part of the warmup sequence. When you step on the gas again, you kick high idle off ...if premature, the engine is cold and it runs ruff, and wikll likely stall under some circumstances until you have reached operating temp. The reason for the ruffness ...is gasoline becomes 'gas' better when the engine is at operating temp than when the engine is cold.

Your battery is getting tired. When you step on the gas and the lights get brighter, it is because you are running the alternator at a higher speed and you are making more electricity which the lights are more than happy to gobble up.

Keep in mind your car is notonly a Caprice Classic ... it is a classic, 26 year old vehicle. It needs a little more TLC than a newer model.